Report a warning/error when multiple instance of `@angular/core` are bundled.

### Command

build

### Description

When the CLI bundles Angular apps it can happen that multiple instances of `@angular/core` are bundled.

This leads to a variety of errors at runtime that are difficult to diagnose for developers.

Currently on the FW repo we point users toward : angular/angular#35586

### Describe the solution you'd like

I'd be great if the CLI could throw a warning/error when it happens so users are aware even before runtime that there is an issue with their bundle and they should have a look at their dependency resolution !

Start with the CLI's build command and investigate how dependency resolution and bundled Angular applications are represented during the build. Review angular/angular#35586 for the reported multiple-@angular/core failure mode. Done means the build reports a warning or error when multiple instances are bundled, before the runtime failure.

Written by the indexing model from the issue text.